feat: Add self-update command and version management

[ops295]

This PR introduces a self-update command to allow users to easily update the CLI to the latest version directly from their terminal. It also adds developer tooling to streamline release management.

Summary

• feat(cli): Added self-update command.
  • Checks GitHub Releases for the latest version.
  • Automatically detects OS (macOS/Linux/Windows) and Architecture (amd64/arm64).
  • Downloads and replaces the current binary in-place safely.
• feat(dev): Added make bump-version target.
  • Usage: make bump-version v=0.2.02
  • Updates version constants in Makefile, main.go, and help.yaml.
• docs: Updated README.md and help.yaml with instructions for the new command.
• chore: Updated CHANGELOG.md for v0.2.02.

Checklist

• I have read CONTRIBUTING.md
• PR is small and focused
• Tests (if any) included or updated

Reviewers

Request review from @hashbuzz-social (or other maintainers). I will review first as requested.

[Copilot]

Pull request overview

This PR adds self-update functionality to the journal-cli, enabling users to update the binary directly from GitHub Releases without external package managers. It also introduces developer tooling for version management and comprehensive architecture documentation.

• Added self-update command that automatically detects OS/architecture and downloads the appropriate binary from GitHub Releases
• Implemented make bump-version target to streamline version updates across multiple files
• Added comprehensive architecture documentation including ADRs and feature documentation

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
internal/updater/self_update.go	Core self-update logic: queries GitHub API, downloads binary, performs in-place replacement with rollback support
cmd/journal/main.go	Integrated self-update subcommand handler before flag parsing
internal/help/help.yaml	Updated version to 0.2.02 and added self-update command documentation
internal/help/help.go	Added rendering logic for the Updates section in help output
README.md	Added Updates section with self-update instructions and documentation links
Makefile	Updated VERSION to 0.2.02 and added bump-version target with sed automation
CHANGELOG.md	Added changelog entry for version 0.2.02
.gitignore	Updated to ignore /journal binary and /bin directory
docs/features/self-update.md	New file documenting self-update feature implementation
docs/features/templates.md	New file documenting template feature
docs/ARCHITECTURE.md	New file providing architecture overview
docs/adr/001-pragmatic-clean-architecture.md	New ADR documenting architectural approach
cmd/journal/main.go.bak	Backup file that should not be in version control
architecture.md	Removed old architecture documentation (replaced by docs/ARCHITECTURE.md)

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[Copilot]

@ops295 I've opened a new pull request, #6, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@ops295 I've opened a new pull request, #7, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@ops295 I've opened a new pull request, #8, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@ops295 I've opened a new pull request, #9, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@ops295 I've opened a new pull request, #10, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@ops295 I've opened a new pull request, #11, to work on those changes. Once the pull request is ready, I'll request review from you.